Property and Equipment, Net (Property and Equipment, Net (Including Assets Held Under Capital Leases)) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 5,710,350	$ 5,491,126
Less: accumulated depreciation	(2,923,995)	(2,678,780)
Property and equipment, net	2,786,355	2,812,346
Towers and Related Components [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	4,951,321	4,772,807
Construction-In-Process [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	35,756	34,689
Furniture, Equipment and Vehicles [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	54,814	53,260
Land, Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 668,459	$ 630,370